Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/bugs/bug-618.js

Index: test/mjsunit/bugs/bug-618.js
diff --git a/test/mjsunit/bugs/bug-618.js b/test/mjsunit/bugs/bug-618.js
index 8f4744035411aac7fdf13c6a298d4269497d89b9..ae843267ff5fab695abbed74eaf1e0c081fa02dc 100644
--- a/test/mjsunit/bugs/bug-618.js
+++ b/test/mjsunit/bugs/bug-618.js
@@ -33,11 +33,11 @@ function C() {
   this.x = 23;
 }
 
-// If a setter is added to the prototype chain of a simple constructor setting 
-// one of the properties assigned in the constructor then this setter is 
+// If a setter is added to the prototype chain of a simple constructor setting
+// one of the properties assigned in the constructor then this setter is
 // ignored when constructing new objects from the constructor.
 
-// This only happens if the setter is added _after_ an instance has been 
+// This only happens if the setter is added _after_ an instance has been
 // created.
 
 assertEquals(23, new C().x);